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ストレス粒子の内のタンパク質相互作用の文脈依存および疾患特有の多様性
Sebastian Markmiller1, Sahar Soltanieh2, Kari L Server1
1Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, CA 92093, USA; Stem Cell Program, University of California, San Diego, La Jolla, CA 92093, USA; Institute for Genomic Medicine, University of California, San Diego, La Jolla, CA 92039, USA.
Cell
|January 27, 2018
まとめ
神経変性に関連したストレス粒子は,新しい成分を特定するために分析されました. 異常なSG行動が ALS患者の細胞で発見され 治療対象となる可能性が明らかになりました
科学分野:
- 細胞生物学
- 神経科学
- 生物化学
背景:
- ストレス・グラニュル (SG) は,細胞のストレスで形成されるダイナミックなRNP集合体である.
- SGは人間の神経変性疾患のメカニズムにますます関与しています.
研究 の 目的:
- 細胞タイプと神経変性的な状況におけるヒトのSGプロテオームと組成の多様性を包括的に特定する.
- SGの形成とダイナミクスのSGタンパク質の相互作用の役割を調査する.
- アミオトロフィック横筋硬化症 (ALS) のSG変異を調査し,神経毒性のインビボ変容因子を特定する.
主な方法:
- マススペクトロメトリーと組み合わせたアスコルベット過酸化酵素 (APEX) の近接ラベルを使用した.
- タンパク質の局所化とSGの特徴化のために免疫光を用いた.
- ALS/FTDの患者由来細胞とドロソフィラモデルで SGの動態と組成を調べた.
主要な成果:
- 約150の新しいヒトのSG成分を特定し,既知のSGプロテオームを拡張しました.
- SGの急速な凝結を促進する 既存のタンパク質の相互作用ネットワークを明らかにした.
- ストレスと細胞タイプに依存するSGの多様性が示され,ニューロンのSGはユニークな複雑性を示しています.
- ALS患者の細胞における異常なSGの動態,組成,分布を観察した.
- ドロソフィラモデルにおける神経毒性のSG関連変形剤を特定した.
結論:
- SGタンパク質は神経変性を理解する上で 重要な役割を果たします
- この発見は,神経変性疾患の治療戦略としてSGをターゲットにするための基盤を提供します.
- SGの組成とダイナミクスは神経変性疾患の重要な要因です.
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